I move about 15 yards straight out from the entrance to cave, make sure you are a good 10 yards beyond the npcs that are helping with the adds. I dont use bloodlust and I position my tank so he gets knocked across ice. The position I use seems to never get hit by ice patches and I never have to strafe my team. Makes it real easy. I use cold resist totem and I do have an AoE healer (druid), although the team never seems to take any damage.